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A recording infrared absorption hygrometer which measures the absolute humidity in a 1-meter light path is described. Record is obtained on a remote self-balancing potentiometer. Use is made of the 1.37 p water vapor absorption band and a 1.24 reference band. Isolation is by means of transmission type interference band-pass liglit ' filters. Infrared detection is by means of a lead sulfide photocell and amplifier. Isolation filters are contained on a sector wheel which is rotated to chop andoi:10.1175/1520-0493(1953)081<0267:iah>2.0.co;2 fatcat:sx3sf2wgtfbjlhrohtryr73zy4